Ideas to to get coins off of binance

Here is my idea : What if someone has a lot of cardano outside of binance. If they were willing to trade them for coins inside of binance then people could get coins out.
The trade would work like this

  1. bob sends alice 1 cardano or equivalent coin on binance
  2. alice sends bob 1 cardano to another wallet outside of binance

Would that make sense? Could it be done safely without alice just not following up on the trade?

Other ideas to get money out are to just convert the ada to ether and move it out to dogecoin with shapeshift for example.